#!/usr/bin/python3

# Copyright (c) 2020-2021 Fpemud <fpemud@sina.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.


from ..errors import EnvironmentVariableNotFound
from ..plugin import AppBase


class AppGreetd(AppBase):

    def get_process_hierachy(self, snapshot):
        ret = {}

        # master process and processes in sessions
        pids = snapshot.query_pids([
                        lambda pid: snapshot.get_process_cmdline(pid) == "greetd",
                        lambda pid: all([snapshot.get_process_cmdline(x) != "greetd" for x in snapshot.get_ancestor_pids(pid)]),        # exclude greetd slave processes
                    ])
        for pid in pids:
            cpids = snapshot.get_descendant_pids(pid)
            cpids = filter(lambda x: snapshot.get_process_cmdline(x) != "greetd", cpids)
            ret[pid] = cpids

        # use greetd master and slave processes
        snapshot.use_pids(
            snapshot.query_pids([
                lambda pid: snapshot.get_process_cmdline(pid) == "greetd",
            ]))

        return ret

    def check(self, snapshot, pid, descendant_pids):
        for pid2 in descendant_pids:
            if not snapshot.has_env_var(pid2, "GREETD_SOCK"):
                raise EnvironmentVariableNotFound(pid2, "GREETD_SOCK")
            snapshot.use_env_var(pid2, "GREETD_SOCK")
